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Heat-insulating material

A technology of thermal insulation material and resin foam, which is used in thin material processing, heat exchange equipment, and pipeline protection through thermal insulation. , The effect of long-term maintenance of thermal insulation and excellent environmental performance

Inactive Publication Date: 2011-01-26
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, due to the large overall cell size, excellent thermal insulation properties cannot be obtained
In addition, since water is used as a foaming agent, it is a technology that is not easy to use polyester-based resins that may be hydrolyzed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0061] As a specific production example of the resin foam by "method 2", mixing polylactic acid and polymethyl methacrylate and foaming it to form pores (L), and then dissolving only polymethacrylic acid A method of decomposing the polymethyl methacrylate with a solvent of methyl ester (toluene-hexane solution, etc.) to generate pores (S) around the pores (L); mixing polystyrene and polylactic acid and making it A method in which pores (L) are generated by foaming, and then only polylactic acid is hydrolyzed to generate pores (S) around the pores (L).

[0062] Here, examples of the foaming agent used in "Method 1" and "Method 2" include chemical foaming agents that generate various gases by thermal decomposition, and physical foaming agents that use various gases themselves. In extrusion foaming, either a chemical foaming agent or a physical foaming agent can be preferably used, and in the batch foaming method, a physical foaming agent is preferably used.

[0063] As chemical...

Embodiment 1

[0213] Using a tandem extruder equipped with a supercritical carbon dioxide supply line, mix the particles of resin (A-1) and resin (A-2) according to the ratio in the table, and supply it to the first extruder. It is melted under the pressure, and then supercritical carbon dioxide is supplied through the front end of the extruder. Next, the temperature was lowered to 170° C. in the second extruder, and it was discharged into the air from a 10 cm long slit die to obtain a resin foam with a thickness of 10 mm. The carbon dioxide gas solubility of the resin (A-1) was 5.5%, and the carbon dioxide gas solubility of the resin (A-2) was 3.7%.

[0214] Table 2 shows the evaluation results of this resin foam. The porosity (X) is 97%, and the number density of pores (L) is 10 6 piece / mm 2 , the number density of pores (S) is 10 6 pieces / μm 2 .

[0215] Next, the resin (B-1) was supplied to a single-screw extruder, heated to 160 to 280° C., and extruded in a sheet form from a T-di...

Embodiment 2

[0221] A resin foam having a thickness of 10 mm was obtained by extrusion foaming in the same manner as in Example 1 using the resin (A-1) and the resin (A-3). The carbon dioxide gas solubility of the resin (A-1) was 5.5%, and the carbon dioxide gas solubility of the resin (A-3) was 9.0%. Table 2 shows the evaluation results of this resin foam. The porosity (X) is 95%, the number density (L) is 10 6 piece / mm 2 , the number density (S) is 10 5 pieces / μm 2 .

[0222] Next, the pellets of resin (B-1) and resin (B-2) were mixed in a weight ratio of 40:60 and supplied to a two-layer laminated sleeve (pinol) immediately in front of the T-shaped mold. Extruder A. Then, the resin (B-3) was supplied to the extruder B connected to the above-mentioned sleeve and short tube. Heat the extruders A and B to 160-280°C and 160-240°C respectively, and use the extruder A and extruder B to form a sheet from the T-die with a lamination ratio (thickness) of 4:1. shape extrusion. The extrud...

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Abstract

A resin foam is provided which has a porosity (X) of 80% or higher and has pores (L) with a pore diameter of 1-1,000 [mu]m and pores (S) with a pore diameter of 0.01-1 [mu]m, excluding 1 [mu]m. The resin foam is excellent in heat-insulating performance and environmental performance. Also provided is a chlorofluorocarbon-free heat-insulating material. This heat-insulating material retains excellent heat-insulating performance for long and is less apt to suffer dew condensation. The heat-insulating material is characterized by comprising a resin foam having a porosity (X) of 80% or higher and having pores (L) with a pore diameter of 1-1,000 [mu]m and pores (S) with a pore diameter of 0.01-1 [mu]m, excluding 1 [mu]m.

Description

technical field [0001] The present invention relates to a resin foam excellent in thermal insulation performance and environmental performance, and a chlorofluorocarbon-free thermal insulation material capable of maintaining the above thermal insulation properties for a long period of time. Background technique [0002] Resin foams such as rigid polyurethane foam, flexible polyurethane foam, and foamed styrene are currently used as thermal insulation materials for houses, etc., and these thermal insulation materials are responsible for reducing air-conditioning and heating equipment as the awareness of energy conservation has increased in recent years. Such a very important role as energy. [0003] Such heat insulating materials generally exhibit excellent heat insulating performance by containing a gas of low thermal conductivity in an extremely small volume inside the resin foam. [0004] Chlorofluorocarbons (CFCs) have been widely used as low thermal conductivity gases i...

Claims

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Application Information

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IPC IPC(8): C08J9/04B32B5/18B32B9/00C08J9/36F16L59/02
CPCC08J9/122C08J9/0061E04B2001/742C08J2201/03E04B1/76C08J9/08Y10T428/249953Y10T428/249991C08J2203/06C08J2205/042C08J2205/048C08J2367/04B29C44/22B29C44/348B29C44/50
Inventor 仲村博门篠一弘木村将弘
Owner TORAY IND INC
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